Livestock Microchipping Laws in Michigan: What Every Producer Needs to Know

If you raise cattle, sheep, goats, horses, or other livestock in Michigan, electronic identification is not just a best practice — it is often a legal requirement before your animals leave the farm. Michigan was one of the first states in the country to mandate radio frequency identification for cattle movement, and the rules have only grown more precise since then.

Understanding exactly where a microchip fits into that framework — versus an RFID ear tag — can save you from a failed health certificate, a turned-away load at a state line, or a disputed ownership claim. This guide walks through every layer of Michigan’s livestock identification rules so you know what device is required, for which species, and when.

Microchipping vs. RFID Ear Tags: What Counts as Official ID in Michigan

The terms “microchip” and “RFID” are often used interchangeably in casual conversation, but Michigan law treats them as distinct devices with different approved uses. Both rely on radio frequency identification technology, but the form factor matters for regulatory purposes.

A livestock microchip is a biocompatible capsule — roughly the size and shape of a grain of rice — that houses a small RFID transponder. When read with a compatible scanner, the chip transmits a unique identification number. An RFID ear tag, by contrast, is a plastic or button-style device clipped to the animal’s ear that carries the same electronic data but is externally visible and readable at a distance.

Michigan’s Michigan Department of Agriculture and Rural Development (MDARD) notes that the term “radio frequency identification (RFID)” is synonymous with the federal term “electronic identification (EID).” However, not every RFID device is interchangeable for official purposes. Before purchasing official 840 RFID tags, producers should check with the seller to make sure the tags selected are approved for use in the intended animal species.

For cattle and bison — the species most tightly regulated in Michigan — the official device is the RFID ear tag, not an implanted microchip. The injectable microchip is generally not a good option for cattle due to the speed of commerce in slaughter facilities, since the area where the microchip is implanted must be cut out and discarded. For other species such as horses, goats, sheep, and cervids, an implanted 840-prefix microchip can serve as official identification under federal and state rules.

Pro Tip: Always confirm the approved device type with MDARD or your accredited veterinarian before tagging, since using the wrong device format — even a legitimate RFID product — can invalidate official identification status for movement or exhibition purposes.

The Federal RFID Mandate and What It Means for Michigan Producers

Federal rules set the floor for livestock identification across all states, and Michigan producers moving animals across state lines must comply with both USDA requirements and Michigan’s own, often stricter, standards.

The USDA Animal and Plant Health Inspection Service (APHIS) amended the animal disease traceability regulations to require that ear tags applied on or after 180 days after publication of the final rule be both visually and electronically readable to be recognized as official ear tags for interstate movement of cattle and bison. This rule became effective November 5, 2024.

The types of cattle required to be identified when moving interstate remain unchanged under the new rule. That list includes dairy cattle, sexually intact beef cattle 18 months or older, and rodeo and exhibition cattle. What changed is the tag itself: cattle tags applied after November 5, 2024, must be both visually and electronically readable (RFID).

Michigan’s connection to this federal push runs deep. Michigan was unable to regain TB-free status in the vast majority of the state until improvements to its traceability program were made following the state’s implementation of mandatory use of RFID ear tags in cattle and bison in 2007. Michigan faces a unique challenge in eradicating bovine TB, as the disease is endemic in free-ranging white-tailed deer in specific areas of the state, and the disease can be transmitted between deer and cattle. Because of this, Michigan maintains a split-state status for TB: the state is divided into a Modified Accredited Zone and Accredited Free areas.

Mandatory RFID tags in Michigan’s traceability program allow immediate uploading of accurate records to MDARD’s system, which in turn allows Michigan to show trading partners proof of where animals have been within the state and helps guarantee rapid response in the event of an animal disease emergency. For more on how disease reporting intersects with identification requirements, see livestock disease reporting in Michigan.

Important Note: As of November 5, 2024, visual-only official identification ear tags — such as metal NUES tags — are no longer considered official identification for cattle and bison when applied after that date. Tags applied before that date retain their official status for the life of the animal.

Producers should also be aware that approved devices for EIDs include 134.2 kHz LF RFID tags compliant with both the ISO 11784 and 11785 standards, or UHF RFID tags. Dairy producers using herd management software should take note: producers using RFID with dairy herd management software should make certain to order half duplex (HDX) low frequency (LF) RFID tags and not full duplex (FDX) LF RFID tags or ultra-high frequency (UHF) RFID tags.

Which Livestock Can Use a Microchip as Official Identification in Michigan

Not every species is subject to the same identification rules, and the type of device that qualifies as “official” varies by animal. Understanding which species can use an injectable microchip — rather than an ear tag — is critical before you invest in a tagging system.

In Michigan, RFID tags are required for movement of cattle and bison, and voluntary for other species. The tags can be used on any animal, but Michigan uses them on sheep, goats, cattle, bison, and most recently, deer and elk farms. This means that for species beyond cattle and bison, producers have more flexibility in choosing between an ear tag and an injectable microchip — as long as the device carries an official 840-prefix number.

The 840-ID official microchip can be used in all equines, goats, sheep, alpaca, llama, elk, whitetail and other deer, and similar species. The FDA’s Center for Veterinary Medicine has also approved the 840-ID microchip for use in sheep and goats.

For swine, the situation is nuanced. Exhibition pigs in Michigan must carry official identification before movement, and 840 RFID tags are the standard. 840 RFID tags used for cattle can also be used in swine, as long as the tags are applied to animals on the same premises. An injectable microchip is not the standard device for swine in Michigan’s exhibition and movement rules — ear tags remain the norm for that species.

For producers raising goats in Michigan, understanding both the identification rules and broader ownership requirements is important. The goat ownership laws in Michigan page covers related regulations in detail.

Species	Injectable Microchip Allowed as Official ID?	Notes
Cattle & Bison	No	RFID ear tag required for all movement
Horses & Equines	Yes	840-prefix microchip accepted; Premises ID required
Sheep & Goats	Yes	840-prefix microchip; Flock/Scrapie ID also required
Deer & Elk (farmed)	Yes	840-prefix microchip accepted
Alpaca & Llama	Yes	840-prefix microchip accepted
Swine	No (standard)	840 RFID ear tag is the standard device

When a Microchip Qualifies for Interstate Movement in Michigan

Moving livestock across state lines triggers a separate layer of federal and state requirements beyond what applies to intrastate movement. For species where a microchip is an approved official ID device, it must meet specific conditions before it will be accepted on an interstate certificate of veterinary inspection (CVI).

The USDA published a final rule in 2013 establishing regulations regarding the traceability of U.S. livestock moving interstate. The rule names specific methods of animal identification that are acceptable, including a 15-digit microchip that begins with the designated United States prefix 840. That 15-digit number is not optional — non-840 chips do not qualify as official identification for interstate movement purposes, regardless of whether they are ISO-compliant.

For cattle and bison leaving Michigan, the rules are more stringent. All bison and cattle must have an official RFID ear tag, unless moving directly to an approved tagging site. An official RFID ear tag is required to leave any premises in Michigan for intrastate movement. An injectable microchip does not substitute for the ear tag requirement in cattle and bison, regardless of its prefix.

For equines and small ruminants moving interstate, the microchip number must appear on the ICVI completed by a USDA-accredited veterinarian. CVIs are valid for 30 days from the date of animal inspection listed on the CVI. If your horse or goat is microchipped with an 840-prefix device, your veterinarian will record that chip number as the animal’s official identification on the health certificate. The chip must be scannable at the time of inspection.

If you are transporting livestock across state lines, Michigan’s movement rules apply both on departure and arrival. Review the full requirements at transporting livestock laws in Michigan to make sure your paperwork and identification are aligned before you load.

Pro Tip: Have your veterinarian scan the microchip during the health certificate inspection — not just before you leave. A chip that has migrated or is unreadable at the time of inspection can cause the CVI to be rejected at the destination state’s border.

Approved Microchip Standards and Placement by Species in Michigan

Michigan recognizes only microchips that meet federal USDA-APHIS standards. Using a non-approved chip — even one that functions perfectly — means the animal has no official identification for regulatory purposes.

The governing standard for official 840-prefix microchips requires a 15-digit number beginning with 840, which is the United States country code. Each chip begins with the United States country code “840,” making it fully compliant with USDA-APHIS and Scrapie regulations. The operating frequency is 134.2 kHz (ISO), and chips must function across an operating temperature range from -13°F to over 185°F. USDA’s official list of approved 840-prefix AIN devices — including injectable transponders — is maintained by USDA APHIS.

Placement varies by species and is designed to keep the implant site out of edible tissue:

• Horses and equines: The left side of the nuchal ligament in the neck, midway between the poll and withers, is the standard injection site used by most breed registries and veterinarians.
• Sheep and goats: The base of the left ear or the neck crest are common sites; confirm with your veterinarian and the specific chip manufacturer’s guidance.
• Deer and elk (farmed): The neck crest or base of the ear, consistent with cervid management protocols.
• Alpaca and llama: The neck crest is the standard site for camelids.

Livestock particularly will need to use recommended injection sites that will not end up in food. For food-producing animals, always confirm placement with your veterinarian before implanting to ensure compliance with both USDA guidelines and Michigan’s animal health requirements.

Designed to last a lifetime, an approved 840-prefix microchip never needs replacing and provides reliable, readable identification. These chips are certified by the USDA for accuracy, durability, and readability. Anti-migration coatings, such as the Bio-Bond or Parylene processes used by major manufacturers, help keep the chip at the implant site and reduce the risk of a failed scan at inspection.

For cattle specifically, RFID ear tag placement follows its own standard. The recommended placement for an 840 RFID ear tag in cattle is the middle third of the ear, between the two cartilage ribs, avoiding blood vessels, following brand-specific instructions. Michigan also requires that you use a tagger appropriate for the tag type purchased.

Registering a Livestock Microchip in Michigan

Implanting a chip is only half the process. For a microchip to function as official identification in Michigan, the chip number must be tied to a registered premises through MDARD’s system. Without that link, the chip number has no traceability value — and traceability is the entire point of the program.

The first step is obtaining a Premises Identification Number (PIN). The PIN is required to purchase 840 tags. In Michigan, call MDARD’s Atlanta Field Office at 888-565-8626 to get or confirm your Premises Identification Number. This number ties every official identification device — whether an ear tag or an injectable microchip — back to the physical location where your animals are housed.

For sheep and goats, there is an additional requirement. If you raise goats or sheep, you must also have a Flock/Scrapie ID in addition to your Premises ID before ordering or using official 840-prefix microchips. The Scrapie program, administered federally through USDA-APHIS, requires that small ruminants be traceable back to their flock of origin.

Once your PIN is in hand, you can order 840-prefix microchips from USDA-approved vendors. The chip numbers begin with the official United States country code of 840. To use these chips you must have a Premises ID. Your veterinarian records the chip number at the time of implantation, and that record should be retained at the farm level for traceability purposes.

• Call MDARD at 888-565-8626 to register your premises and get your PIN
• Obtain your Flock/Scrapie ID from USDA-APHIS if you raise sheep or goats
• Order 840-prefix microchips only from USDA-approved vendors — confirm species approval before ordering
• Have a licensed veterinarian implant the chip and record the number in writing
• Retain implantation records on-farm; they may be audited by MDARD

Michigan law also makes it illegal to tamper with official identification. Official ID may not be shared with or transferred to another premises. It is illegal to remove official ID or to apply more than one official ID. This applies equally to microchips and ear tags — once an official 840-prefix chip is implanted, it stays with that animal.

If you are also navigating Michigan’s brucellosis testing requirements — which often apply to the same cattle and bison subject to RFID tagging — see the brucellosis laws in Michigan page for testing and movement requirements that run parallel to the identification rules.

Microchipping as Proof of Ownership in Michigan

Beyond regulatory compliance, a microchip serves a practical ownership function that ear tags alone cannot always provide. Ear tags can be removed, lost, or switched. An implanted microchip, properly registered, is a permanent record tied to a specific animal and a specific premises.

Microchipping is a safe, permanent, and highly effective form of tagging or branding animals. Implanted in each animal on your farm, livestock will have a permanent form of identification and proof of ownership. Although no one plans to have their animals lost or stolen, accidents sometimes happen, and when they do, you will be glad if your animals are equipped with microchips.

In a livestock theft or dispute scenario, a microchip number that matches your Premises ID and veterinary implantation records creates a documented chain of custody that a visual ear tag cannot replicate. Michigan law does not currently designate microchipping as the sole legal proof of ownership for livestock, but the combination of a chip number, a registered PIN, and veterinary records is strong evidence in any civil or administrative proceeding.

The unique identification code stored in the RFID chip enables traceability throughout the animal’s lifecycle, from birth to slaughter. RFID tags facilitate the collection, storage, and transmission of data regarding individual animals’ movements, health status, and ownership history. For producers who sell breeding stock, show animals, or registered animals across state lines, that ownership history has real commercial value.

If your livestock are also subject to Michigan’s general animal cruelty statutes — which can intersect with ownership disputes — the animal cruelty laws in Michigan page covers how ownership is treated in those contexts. Producers with horses should also be aware that Michigan maintains a separate registry for equine racing and breeding purposes through MDARD.

For producers who keep backyard chickens, goats, or other small livestock alongside their larger herds, related Michigan rules are covered at backyard chicken laws in Michigan and goat ownership laws in Michigan.

Key Insight: Keep a copy of your veterinarian’s implantation record, the chip’s packaging sticker showing the 15-digit number, and your MDARD Premises ID confirmation in the same file. That combination is your strongest proof of ownership if an animal is lost, stolen, or involved in a legal dispute.

Michigan’s livestock identification framework rewards producers who stay ahead of compliance. Whether you are tagging cattle with 840 RFID ear tags before they leave your premises, microchipping horses for interstate health certificates, or registering small ruminants under the Scrapie program, the steps are straightforward once you know which rules apply to your species. Start with your Premises ID, confirm the approved device for each animal type, and document every implantation — that paper trail is both a legal requirement and your best protection.